U need to figure that once that plants get tall the light goes up and light will be harder to reach the outer plants and lower sides, also a 600 will penetrate the canopy better. If u were doing just 2 rows a 400 would work. The 400watters are great, but there really not all that powerful once the plants get big, there great i mean awsome if u do a lsting, scrog, or 4 plant grow.
JackdaWack Reviewed by JackdaWack on . basic lighting question-400 vs 600 12 plants, three gallon buckets, 3 rows of four buckets in sectioned off area of a spare bedroom, not quite a grow box, more like a room in a room, using florescent as supplemental lighting.....can i do it with one 400w mh/hps or should i go with a 600w?:woohoo: Rating: 5